[PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later

[PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later

[Mario Limonciello]

From: Mario Limonciello <mario.limonciello@amd.com>

arch_init_invariance_cppc() is called at the end of
acpi_cppc_processor_probe() in order to configure frequency invariance
based upon the values from _CPC.

This however doesn't work on AMD CPPC shared memory designs that have
AMD preferred cores enabled because _CPC needs to be analyzed from all
cores to judge if preferred cores are enabled.

This issue manifests to users as a warning since commit 21fb59ab4b97
("ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"):
```
Could not retrieve highest performance (-19)
```

However the warning isn't the cause of this, it was actually
commit 279f838a61f9 ("x86/amd: Detect preferred cores in
amd_get_boost_ratio_numerator()") which exposed the issue.

To fix this problem, push the call to the arch_init_invariance_cppc()
macro to the end of acpi_processor_driver_init().

Fixes: 279f838a61f9 ("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()")
Reported-by: Ivan Shapovalov <intelfx@intelfx.name>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219431
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/acpi/cppc_acpi.c        | 2 --
 drivers/acpi/processor_driver.c | 1 +
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index c3fc2c05d8687..f8614771bf32b 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -905,8 +905,6 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
 		goto out_free;
 	}
 
-	arch_init_invariance_cppc();
-
 	kfree(output.pointer);
 	return 0;
 
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index cb52dd000b958..59620e7bc6647 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -270,6 +270,7 @@ static int __init acpi_processor_driver_init(void)
 				  NULL, acpi_soft_cpu_dead);
 
 	acpi_processor_throttling_init();
+	arch_init_invariance_cppc();
 	return 0;
 err:
 	driver_unregister(&acpi_processor_driver);
-- 
2.43.0

Re: [PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later

[kernel test robot]

Hi Mario,

kernel test robot noticed the following build errors:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on rafael-pm/bleeding-edge linus/master v6.12-rc5 next-20241031]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mario-Limonciello/ACPI-processor-Move-arch_init_invariance_cppc-call-later/20241030-015107
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20241029174910.600482-1-superm1%40kernel.org
patch subject: [PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later
config: riscv-randconfig-r071-20241031 (https://download.01.org/0day-ci/archive/20241031/202410311801.4Cjd0Myc-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241031/202410311801.4Cjd0Myc-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410311801.4Cjd0Myc-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/acpi/processor_driver.c: In function 'acpi_processor_driver_init':
>> drivers/acpi/processor_driver.c:273:9: error: implicit declaration of function 'arch_init_invariance_cppc' [-Wimplicit-function-declaration]
     273 |         arch_init_invariance_cppc();
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [m]:
   - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]


vim +/arch_init_invariance_cppc +273 drivers/acpi/processor_driver.c

   239	
   240	/*
   241	 * We keep the driver loaded even when ACPI is not running.
   242	 * This is needed for the powernow-k8 driver, that works even without
   243	 * ACPI, but needs symbols from this driver
   244	 */
   245	static enum cpuhp_state hp_online;
   246	static int __init acpi_processor_driver_init(void)
   247	{
   248		int result = 0;
   249	
   250		if (acpi_disabled)
   251			return 0;
   252	
   253		if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
   254					       CPUFREQ_POLICY_NOTIFIER)) {
   255			acpi_processor_cpufreq_init = true;
   256			acpi_processor_ignore_ppc_init();
   257		}
   258	
   259		result = driver_register(&acpi_processor_driver);
   260		if (result < 0)
   261			return result;
   262	
   263		result = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
   264					   "acpi/cpu-drv:online",
   265					   acpi_soft_cpu_online, NULL);
   266		if (result < 0)
   267			goto err;
   268		hp_online = result;
   269		cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
   270					  NULL, acpi_soft_cpu_dead);
   271	
   272		acpi_processor_throttling_init();
 > 273		arch_init_invariance_cppc();
   274		return 0;
   275	err:
   276		driver_unregister(&acpi_processor_driver);
   277		return result;
   278	}
   279	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later

[kernel test robot]

Hi Mario,

kernel test robot noticed the following build errors:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on rafael-pm/bleeding-edge linus/master v6.12-rc5 next-20241031]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mario-Limonciello/ACPI-processor-Move-arch_init_invariance_cppc-call-later/20241030-015107
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20241029174910.600482-1-superm1%40kernel.org
patch subject: [PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later
config: i386-randconfig-141-20241031 (https://download.01.org/0day-ci/archive/20241031/202410311924.XtRR5d9M-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241031/202410311924.XtRR5d9M-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410311924.XtRR5d9M-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/acpi/processor_driver.c:273:2: error: call to undeclared function 'arch_init_invariance_cppc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     273 |         arch_init_invariance_cppc();
         |         ^
   1 error generated.


vim +/arch_init_invariance_cppc +273 drivers/acpi/processor_driver.c

   239	
   240	/*
   241	 * We keep the driver loaded even when ACPI is not running.
   242	 * This is needed for the powernow-k8 driver, that works even without
   243	 * ACPI, but needs symbols from this driver
   244	 */
   245	static enum cpuhp_state hp_online;
   246	static int __init acpi_processor_driver_init(void)
   247	{
   248		int result = 0;
   249	
   250		if (acpi_disabled)
   251			return 0;
   252	
   253		if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
   254					       CPUFREQ_POLICY_NOTIFIER)) {
   255			acpi_processor_cpufreq_init = true;
   256			acpi_processor_ignore_ppc_init();
   257		}
   258	
   259		result = driver_register(&acpi_processor_driver);
   260		if (result < 0)
   261			return result;
   262	
   263		result = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
   264					   "acpi/cpu-drv:online",
   265					   acpi_soft_cpu_online, NULL);
   266		if (result < 0)
   267			goto err;
   268		hp_online = result;
   269		cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
   270					  NULL, acpi_soft_cpu_dead);
   271	
   272		acpi_processor_throttling_init();
 > 273		arch_init_invariance_cppc();
   274		return 0;
   275	err:
   276		driver_unregister(&acpi_processor_driver);
   277		return result;
   278	}
   279	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki